Manage global umask and shell profiles on Slackware

1. Goal

Control default file and directory permissions for users, services, and login scripts.

2. Files and components involved

/etc/profile
/etc/login.defs
~/.bashrc
~/.profile

3. Operational flow

grep -n umask /etc/profile /etc/login.defs
set umask 027 in the required profiles
reopen shell

4. Operational verification

umask
touch /tmp/test-umask
mkdir /tmp/test-dir-umask
ls -ld /tmp/test-*

5. Practical notes

Apply these changes during a maintenance window and keep a backup of the original files for a quick rollback.

Quick checklist

[ ] Backup or copy of the existing configuration completed
[ ] Files and commands updated as expected
[ ] Local test completed successfully
[ ] Logs or final output verified
[ ] Rollback procedure documented

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